Mf3070 adding backhoe to open center hydraulics

[Prsmf3070]

Trying to connect a three point backhoe to my mf3070.
The backhoe is open center, as well as the tractor.
I want to just put a male/female push connector on one of the hoses going into or coming out of the valves. But am having trouble getting any answers from the dealers I contacted. Open center so it is all in series. Just want to double check my thought process.

My next question is how do I determine the thread type/ angle/ size short of buying one of each and testing them.



This is a diagram of the backhoe.

Any thoughts or suggestions are greatly appreciated.

Thank you all.

 

[Dave M7040]

The danger most owners don't realize is that the tank or return to reservoir port on a valve is not designed to handle hydraulic fluid under pressure which happens when this port is used to feed another valve. The material from your manual is incomplete so it would help if the partial pages along the right hand side could be posted.
You need to be extremely careful in this project and cannot just try something and see if it works as you can break very expensive parts in a second.

This valve literature shows why a power beyond feature of valves feeding other valves usually needs to be used.

This photo shows what can happen if a mistake is made.

Is the backhoe a MF attachment or another brand?

From looking at the schematic, is the screw adjustment to determine how much hydraulic flow goes to the back hoe and the rest of the tractor?

What hydraulic capacity does your tractor have: gpm, psi.
What are the backhoe requirements?
Do you have a FEL? Any idea of its hydraulic requirements?

Dave M7040

 

[Prsmf3070]

The mf3070 is rated 2610psi with 13.2 gpm and 15.9gal capacity.
The backhoe is arps730 and needs 8-10gpm.

I am worried about the fact that the backhoe flow regulator would decrease the amount of flow to the rest of the system as it is dropping the rate of flow from 13 down to 10 and and excess is being sent back into the tank not through the rest of the system. This I don't believe would be an issue if the backhoe is the last valve in the system. However I am having trouble finding any information as to which lines are supply vs. Return and where the hydraulic clutch is in the series. Also if or where a power beyond plug is located.

I don't know what a FEL is.
Front end loader perhaps? The four quick connects in the back are operating the loader. With electric over hydraulic levers in the cab. Several mechanics said to just plug into these and wire the lever forward. This does work but does not allow me to use the bucket for stability and is just for lack of a better term impractical/jankity.

The last pic you showed is exactly why I am researching Dave.
Part prices being what they are and dealers being over three hours away: don't allow for brash decisions.

Thank you for your help Dave.

I also attached the other pages to the backhoe's manual.

 

[Dave M7040]

The mf3070 is rated 2610psi with 13.2 gpm and 15.9gal capacity.
The backhoe is arps730 and needs 8-10gpm.

I am worried about the fact that the backhoe flow regulator would decrease the amount of flow to the rest of the system as it is dropping the rate of flow from 13 down to 10 and and excess is being sent back into the tank not through the rest of the system. This I don't believe would be an issue if the backhoe is the last valve in the system. However I am having trouble finding any information as to which lines are supply vs. Return and where the hydraulic clutch is in the series. Also if or where a power beyond plug is located.

I don't know what a FEL is.
Front end loader perhaps? The four quick connects in the back are operating the loader. With electric over hydraulic levers in the cab. Several mechanics said to just plug into these and wire the lever forward. This does work but does not allow me to use the bucket for stability and is just for lack of a better term impractical/jankity.

The last pic you showed is exactly why I am researching Dave.
Part prices being what they are and dealers being over three hours away: don't allow for brash decisions.

Thank you for your help Dave.

I also attached the other pages to the backhoe's manual.
View attachment 542789View attachment 542790

I have looked over the material on the ARPS web site.

First re your tractor. Although Tractor Data lists the hydraulic system of your tractor as 13.2 gpm, most likely some of that flow is dedicated to the hydrostatic steering system through a priority valve which reserves at least 2 gpm for the steering system and also the clutch if indeed it is hydraulically operated so in reality for external attachments you will have at most approx 10 gpm.

Of course having the ARPS pto driven pump with its own reservoir would be the simplest way to go.
Otherwise, you are going to have to take great care to remove any hydraulic fluid from the backhoe cylinders so you don't contaminate your tractor's system.

I gather that this backhoe has been installed on another tractor before yours? What make and model?

Your front end loader install. It does not sound like it came from Massey plumbed the way you describe. Do you have a dedicated FEL valve or just the rear remote valves to control the FEL?

Do you have to do anything to switch between your rear remote/FEL and 3 pt to operate the 3 pt hitch?

Can you please post some photos of your overall tractor and then hydraulic pump.

It may, in the end, make more sense to plumb the FEL with a new valve with a power beyond port which would be used to operate the backhoe.

In that way, the new FEL valve would keep the FEL arms and bucket from moving when you are using the backhoe.


Dave M7040

 

[dfkrug]

I am worried about the fact that the backhoe flow regulator would decrease the amount of flow to the rest of the system as it is dropping the rate of flow from 13 down to 10 and and excess is being sent back into the tank not through the rest of the system. This I don't believe would be an issue if the backhoe is the last valve in the system.

Looking at your last diagram, the surge valve in the hoe's return makes no sense if you have direct access
to a reservoir port. Back pressure on the return side of the hoe valve can only occur if it is connected to
the IN port of another valve. I have never seen any 3-pt hoe come with such a valve.

That latter case DOES happen in a lot of hoe installs that use the tractor's hyd system, but the last
valve is usually the 3-pt valve. In that case the 3-pt valve is kept from operating because the hoe is
in the way.

If hoes came with PB valves (3 hoses) then downstream valves would not be a problem. I have
never seen any aftermarket hoes come with such a valve, however.

The hoe's return ideally goes directly to the tank, and any obstruction of the return line is bad, as
it causes unnecessary oil heating. Sadly most tractor makers do not provide extra easy-access tank ports.